Decided to build some wheel chocks as I wait for warner temperatures so I can continue work on canopy. Made chocks out of aluminum angle (1-1/2"x 1-1/2"x 1/8").. Each chock is 9" long and I drilled 5 holes in them to make them as light as possible and still be strong enough to function properly. Will paint yellow or orange and attach cord to them for a total of two sets for main wheels.